Steve,
Brian has a valid point, soldering of these would probably
'round off' the corners of the pins at prevent a tight seal when wire
wrapped. If you're going to do donuts, you can either get them in
singles and tool up a carrier to load them or buy them pre-fab in the
pattern you need so you just drop on one pattern per connector. They are
held together with little solder webs in between each donut that
separate at the point of reflow. Whichever style you end up with, get
them prefluxed with your flux of choice and solder them with a hot air
station....
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Thursday, March 11, 2004 10:14 AM
To: [log in to unmask]
Subject: Re: [TN] How would you solder this Backplane?
IMHO, not a good idea to tin wire wrap "spikes". The sharp corner should
penetrate the wire slightly to provide an intimate interface that cannot
oxidise. The one time I had a job like that, we used preforms on each
spike and reflowed in an IR oven. The stamped preforms were in the form
of strips of "washers" at 0.156" pitch with the stem between each washer
fairly thin. We had to apply the flux to the board before threading the
preforms. We made them ourselves using solid solder strip as the
starting point. If I had to do it today, I think I'd dispense a blob of
solder paste (it didn't exist in the late 60s) with an X-Y-Z dispenser.
Fortunately, we had only about a dozen to make, but each one had over
10,000 spikes from the back of connectors. The only "wiring" on the
single-sided 2.4 mm PCB was the power connections (I think ±15 V for
analogue and +5 V for digital plus the two grounds). All the signal
wiring was wire-wrapped.
Brian
Steve Gregory wrote:
> Mornin' All!
>
> One of the guys from our bid department asked me to come and look at a
> backplane we're bidding on, and tell him how we would solder it? I
> went and looked at it, and I'm not sure how we would. Go to
> http://www.stevezeva.homestead.com
> and take a look at Backplane Topside, Backplane Backside, and
Backplane
> Backside Leads.
>
> The leads for all the connectors protrude at least a half inch or
> longer out the bottom of the board. I'm assuming they are that long
> because they get wire wrapped after the backplane is assembled. But
> how do you solder something like that? Some sort of dip solder pot?
> Drag solder? I don't think I'm going to be able to solder a board with
> leads that long in our Electra wave solder.
>
> I can tell board was mass soldered, and I'm thinking it was dipped
> somehow. Because you can see tiny little peaks on most of the lead
> tips that go straight up and down. Is there such thing as some sort of
> dip solder machine?
>
> Sorry for all the dumb questions, but I've never been around a
> backplane like this, and don't really know how something like this
> gets built.
>
> Thanks!
>
> -Steve Gregory-
>
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